Does anyone know what the speed of light is?
2006-07-24 03:27:04 · 16 answers · asked by Anonymous in Science & Mathematics ➔ Physics
299 792 458 m / s
2006-07-24 03:29:54 · answer #1 · answered by drfghdfghdfgh 2 · 0⤊ 1⤋
3 times 10 power 8
2006-07-24 11:57:36 · answer #2 · answered by FRANCI 1 · 0⤊ 0⤋
It is the speed of photons of the light ray = 3*(10^8) m/s
2006-07-24 10:30:18 · answer #3 · answered by Kevin 5 · 0⤊ 0⤋
In metric units, c is exactly 299,792,458 metres per second, in vacuum.
Speed of light varies inversely with the refractive ndex of the medium. For eg. in water having refractive index 4/3, the speed of light is around 3/4*c =2.25 x 10^8 metres per second
2006-07-24 10:34:32 · answer #4 · answered by GOVIND C 2 · 0⤊ 0⤋
the speed of light = 299 792 458 m / s
2006-07-24 10:30:46 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Scientists have learned through experimentation that light behaves like a particle at times and like a wave at other times. The particle-like features are called photons. Photons are different from particles of matter in that they have no mass and always move at the constant speed of about 300,000 km/sec (186,000 mi/sec) when they are in a vacuum. When light diffracts, or bends slightly as it passes around a corner, it shows wavelike behavior. The waves associated with light are called electromagnetic waves because they consist of changing electric and magnetic fields.
2006-07-24 10:34:59 · answer #6 · answered by Charles D 2 · 0⤊ 0⤋
If our universe has a Newtonian background, ie. if there is an absolute time underlying the space-time continuum, then there is no threat on causality by superluminal processes, because time travel and its paradoxes are excluded a priori. And thus, within this framework, faster-than-light travel is possible, at least in principle.
2006-07-24 11:15:28 · answer #7 · answered by Anonymous · 0⤊ 0⤋
10 raise to the power 9
2006-07-24 10:30:15 · answer #8 · answered by Anonymous · 0⤊ 0⤋
299 792 458 metre per second
2006-07-24 10:55:01 · answer #9 · answered by star123 2 · 0⤊ 0⤋
3X10^8 m/s in a vacuum
speed of light varies in differant mediums
2006-07-24 11:39:30 · answer #10 · answered by Rajan 3 · 0⤊ 0⤋